Added promo-small html file

Base html file added to start working with.
Added promo-large html file

Base html file added to start working with.
Added buttons html file

Base html file added to start working with.
Added product-list-item html file

Base html file added to start working with.
Added search-field html file

Base html file added to start working with.
Prepared all html files to work

All html files under style guide have been updated with base html code
and titles given to all the files.